commit

src/Main2.java

+public class Main2 {
+    public static void main(String[] args){
+
+        Point a = new Point();
+        a.set(4.1, 5.6);
+
+        Point b = new Point();
+        b.set(9.6, 10.7);
+
+        Point c = new Point();
+        c.set(105.9, 87.1);
+
+        Point d = b;
+        d.set(5.2, 10.9);
+
+        System.out.println("a is" + a.x + " " + a.y);
+        System.out.println("b is" + b.x + " " + b.y);
+        System.out.println("c is" + c.x + " " + c.y);
+
+    }
+}

src/Point.java

+public class Point {
+    double x;
+    double y;
+}